Cope.J 482 [May 21, 



TORTRICINA- 

 TORTRICID.E. 



Intermaxillary bone dentate ; eye covered by a single scute. Tortrix Oppsl. 

 Intermaxillary edentulous ; eye surrounded by distinct scales 



' Oylindrophis Wagl. 

 RHINOPHID^E. 



I. Tail terminating in a large shield. 



Rostral plate produced posteriorly, separating the nasals. Rhinophis Hemp. 

 Rostral not produced ; nasals in contact Uropeltis Cuv. 



II. Tail scaly to end. 



Tail terminating in a disk of keeled scales ; supraorbitals and postocular 

 confluent Silybura Gr. 



Tail compressed, truncated, terminating in a bicuspid scale, the points 

 superposed ; postocular distinct Plectrurus D. & B. 



Tail tapering, terminal scute ending in a horizontal ridge ; no chin -groove 



Platyplectrurus Giinth. 



Tail tapering, ending in a single point ; no chin groove 



Teretrurus Bedd. 



Tail with smooth scales, terminating in one or two points ; postocular 

 united with superciliary ; a median chin-groove.. MelanopMdium Gthr. 



ASINEA. 

 XENOPELTID^E. 



Eyes not covered with a plate ; head with normal shields, with an inter- 

 parietal added ; scales smooth ; anal and subcaudals divided ; teeth 

 equal Xenopeltis Reinw. 



PYTHONIDJE. 



I. Premaxillary teeth present. 



a. Fossae in labial plates of both jaws. 



Scuta on end of muzzle only Morelia Gray. 



Scuta extending to between orbits Python Daudin. 



Scuta covering vertex and muzzle Liasis* Gray. 



an.. Fossae in inferior labials only. 

 Muzzle shielded to frontal region Nardoa Gray. 



aaa. No labial fossae 



Head shielded ; tail prehensile Aspidiotes Krefft. 



Head with nine regular shields above ; rostrals plate protuberant; tail not 

 prehensile ,, Loxocemus Cope . 



II. No premaxillary teeth. \ 



Labial plates with fossae ; vertex and front squamous ; nostril in one nasal ; 



scales smooth . , Chondropython Meyer. 



Head covered with large scuta Aspidopython Meyer. 



* IAopython Hubrecht. 

 t Teste Boulenger. 



